Pump-piston



GEORGE H. WBIGHTSON, JR., 0F BUTTE, MQNTANA.

PUMP-PISTON.

Specication of Letters Patent.

Patented Aug. 22, 1916.

application filed June 4, 1915. Serial No. 82,200.

' sulfuric acid, or the salts-fof sulfuric acid in contact with themetal.

which under certain conditions will form an acid, or in handling/solutions of acid in connection with vali/[dus industrial enterprises,are comparativl y well-known. The U. S. Patent No. 1,133,778, issued tothis "apilicantjunder datel of March 30th, 1915,

disclses'aV pump piston of glass or porcelain, having Yavcentrallongitudinal opening through which a rod forming an extension of thepiston rod is passed, but this structure, though an improvement over theprior art, leaves a certain amount of metal exposed to the action of thechemicals contained in the fluid being pumped. Previous to the issue ofthe patent, attempts were made to provide a non-corrosive kpiston bycast-inge vitreous piston about au iron core. This could not besuccessful on account of the different cri-efficients lof expansion ofthe glass and metal. f

The object of the. present invention is to provide a non-corrosive pumppiston in which there are no metal parts exposed to the liquid beingpumped, the exposed parts being of glass or porcelain, and yhaving theconnection between the glass or porcelain and the piston rod madewithoutthe necessity for casting the vitreous material about or vVthlthis end in view, I have evolved a piston which is solid at the forwardend so that an uninterrupted surface of vitreous material is presentedto the liquid, but which at the rear, is provided with means forestablishing an interlocking engagement .with the piston rod, soarranged that both parts may be formed separately and then assembled toform a rigid structure, obviating the necessity for casting thev glassaround the metal or vice versa.

In the accompanying drawings, I have illustrated a piston and means forconnecting the piston rod, several forms bein shown, the interlockingelements 'of the piston being in one instance internally and in 'theother externally placed..

Figure 1 is a central longitudinal section of one form of the invention;Fig. 2 is an end view looking from the rear or crank end of the piston;Fig. 3 is a section on the line 3, 3 of Fig. l; Fig. s is a centrallongitudinal section of a piston embodying the invention in a slightlydifferent form, the interlocking' connection being external in thisinstance, instead of internal as in the previous figures; Fig. 5 is aview of the piston and piston rod; Fig. 6 is a view of the vitreousportion of the piston; Figs. 7 and 8 are detail views of the metallicconnecting members; Fig. 9 is a perspective view of the porcelain orvitreous member in 'a slightly different form of the invention; Fig. l()is a vertical central section showing the piston assembled withprojecting bolts for the attachment of the piston rod; and Fig. 11 showsa similar construction with the piston rod made integral, a portion ofthe rod being shown.

Referring to the drawings by numerals, I have shown in Figs. l', 2 and3, a piston composed of a cylindrical `Ablock 1 of vitro! ous material,as glass, porcelain, or the like.y apertured from the rear at 2 andsolid at the forward end 3 which, as shown, is shaped to conform to thecylinder head of the pump. The opening 2 is formed in the cylinder ascast. As shown, it is a longitudinal central slot 4, the ends 5 of theslot being shown as formed of an arc concentric with the axis 6, and atintervals, the slot 4 is recessed as at 7, the recesses being preferablyarcuate and concentric with the axis (S and having their wallscontinuous with and of the same radius as the arcuate Walls 5 at the endof the slot 4. The aperture 2 consisting lof the slotv 4 and thechambers 7, is formed to receive and interlock with a metallic memberwhich may be theend f the piston rod or a core to which th' piston rodis attached. This is shown at 8 1n the form of a rod or bar havingtransverse shoulders 9 at intervals equal to those which separate thechambers 7. These shoulders are in cross-section, as shown in Fig. 3,similar to and slightly less than that of the slot 4 and of a. length,e., the dimension taken at right angles to the plane of thiscross-section, slightly less than that of the chambers 7, so that toseat the core and establish the interlocking engagement referred to, itis only necessary far as itY will go, or until V.- nre oppositeA theChambers.-

so that the ends of theshould chambers. In this 'o looked and 4cannotbeflfe'rl'l (1 thoughit may hereniovel'by-dissol otherwise softeningAthe comen g second modification of my invention lis shown in Figs. 4to8.; In this a, solidzcylin- .-drical piston` 1Q ofvitreous materialisused. 20

The oylindrical'member' has, at therear end,v a. shoulder l'l, -whie his'engaged by a 'metalle collars-12 having an internal shoulder 13 toooperate with thefshoulder 1l for-19. ing an external interlockingengagement' lieg tween the metal andporcelain. The col/ler"l '12, in the'form of the yinvention' shownfis internally' threaded at 14e` and'thisthread isengaged by` a corresponding threaded end Y 15 on the pistonrod, shown fragmentarily at 16. For the purpose of centering the partsand establishing a more rigid engagement, thev cylinder has-a centralpocket-at i7 which is engaged by a projecting stud 180o' the ,rod l1.6.A wrench or similar meaiisniay be used for rotating the-collar 1Qrelatively tothe piston rod and cylinder and the'external surface oftheI coller is .shown vas formed with flat snraees 19 i which lnay bearrange. 1n the forni or" a hexagon or otherwise, or any kind of anengagement, asa Spanner orsimilar device, mayB 'De used. vIn this Way,the parts may betxghtenedto any desired degreeand as- ,"semnled in anabsolutely rigidrelat-ion.

in Figs. 9'fto 'l1 lha-ve shown a slightly different form of theinvention in which.

therev isa `oroelain or vitreous member 20 4having e.'d angeor' head 21to be seated lin a socket 22aper'tured at 23 to permit theplungerlproper() to project. Thevilange orhead-l is held in position inthe socket by means of a-plug '24 threaded at '125 to engage an internalthread 26 in the socket.

The flange Zi has notches in its-periphery t0 1 receive 'bolts'28 whichpass through suitable holt, holes 29 in the bottom of the socket, and30' in the plum The bolts 28 are adapted tio engageanytning in the na4vture 'ofa connecting rodwhieh Ait may oe desiredA to attach, or theConnecting rod 31 me; be'made integral with tlieplllg 32 as 'shown inFig. il. In this instance, there is a porcelain piston 21') having aninterlocking engagement with n. socket .212 and plug 2&1. -In additionto his interlocking en- @new ,an d ruisoi" my iiieinen s; rigideonneetion inode r'yiston ro-1i and a vvitreozrs piston 'the ire rigidlyconn ed i '@"efrsityfor tasting4 .anni time, ali the o that Vthe enti'resented .to the tei-iai.

il pump piston '95; (zal block of vitreous material 4having shouldersand metallic means' for Connecting theblock to .the nio Jig parts'oi"the pump, the. metal members aise having shoulders to en# gage those ofthe bloei( ancilforrn an iinterlookin 'r omini-.ation iietveen-'the'..i'netal and the v :the lclindrieal block being @fastsoperatolyrom the'n 1etal parts and having its forward.' and lateralsur-A faces, so far they are exposed tothe liquid pumped, coniinnonsandthe nieta-l portions exposedrrt the rear of the piston only, sothat theyare not in Contact with the liquid inthe normal operation of the pump. f

3. A. pnn'ip plunger or piston consisting of a oyiindrieai hloalroiivitreous material and mechanical ineens for connecting the block to` themrwing parte; of the pump, the block having a slot with side chambers,and tesi metallic connections eonsisting'o a rod iijflfl diameter to'enter the slot, the rod he shoulders adapted to pase through the slot,lso that when the rod is turned through?inv angle of the shouldersenterthe chani. bers in the slot ,andi form arigi ooniiec tion.

4. A pomp pinngeror pistonieonsisting of ay cylindrical hioer ofvitreous materiel and mechanical means for oonneotingthe block..

` consisting of :i rofl oa diameter to enter the slot, rod havingshoilders adapted to 13 pass through the slot, so that when the i turnedthrough an anglo of 90, the shoulders enter the chambers in the slot andforni 'and mechanical means for connecting'y the block tothe movingparts of the pump, the block having a slot with side chambers, the slotbeing longi-mlmal and being open :it the rear end of the piston only,metallic connections consisting of :i rod of :1 diameter to enter theslot, the rod having shoulders adapted to pass through the slot, so thatwhen the rod is turned through an ongle of 90, the shoulders enter henhambers in the slot and form a rigid connecion, the excfss space in theaperture being filled Wim; cement. l

Signed by me at Butte, Momma, this 29 vitnesses:

ALBERT A. CALLOW, JOHN N. HASKNQ

